Nakamura decides to retreat with the bishop. The other plan is to capture on c6 and play with a quick d2-d4.
9... c8d7  10. f1b5 It's difficult to say which is the best square for the bishop. It's also not clear what White is going to do after …a7-a6, whether he takes on c6 or comes back. 10... a8c8  11. e1g1  11... a7a6 